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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da95fe28bf9122fb50a140bf66e59d4bda944c0404a2a1733a991b4b039bbcb4' 
  AND token = 'H7PLtq2KBWJYL9Wl7p4mqxKd1viry2lLZs0bLaRSfB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}